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ISO 4648

2nd Edition, March 1, 1991

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Rubber, Vulcanized or Thermoplastic - Determination of Dimensions of Test Pieces and Products for Test Purposes

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Superseded By: ISO 23529

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This International Standard specifies five methods for the measurement of the dimensions of solid vulcanized rubber, the method chosen in any particular case being essentially dependent on the magnitude of the dimension to be measured. Three of the methods, designated AI, B and C, are of general use over their specified ranges of applicability. Method A2 is a non-contact procedure often necessary for test pieces taken from products such as "O" rings, conveyor belts and hose, and method A3 is essentially for the measurement of compression set test pieces.

Other measuring equipment may be used when special conditions arise, for example when the test piece or product has a curved surface or complex shape, or when there is a requirement for higher or lower accuracy. Such other equipment includes cone gauges, manual micrometers, plug gauges and calibrated spheres. In all cases the means of supporting the item to be measured shall not cause any distortion of the rubber, and the method of use of the equipment shall be such as to avoid any significant change in the dimension being determined

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